By V. N. Maller
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Extra resources for Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum
23 shows the uniform field breakdown gradients in SFfi as a function of pressure for different electrode materials , In the case of parallel plane electrodes at gas pressure up to 8 bar the dielectric strength of SFg was found to be a function of the mechanical strength of the electroae material, its work function and melting temperature. At higher pressures, similar dependence of the breakdown voltages on the electrode materials have been reported in other gases and their mixtures with SFfi .
20). Corona Formation The utility of a dielectric gas in many engineering applications gets severely limited by the problem of corona formation. Since in a commercial equipment it is practically impossible to avoid some degree of non-uniformity in the electrical field established in a dielectric gas medium, the voltage and conditions at which corona is formed appears to be of fundamental importance to the design engineer especially in the applications involving SFfi gas which is susceptible to severe chemical degradation when exposed to an electric discharge.
Ratio of breakdown voltages with particles to without particles (conducting) in SF 6 . FACTORS AFFECTING THE BREAKDOWN STRENGTH OF SF. GAS 6 Although the breakdown strength o f gases under well controlled conditions may be expected to attain values shown in the ea r lier sections, in practical apparatus it is common to achieve only half as much or even less. In many case s the operating voltages are only 10% of those obtained in the labo ratory. In other word s, the amount of voltage insulated by a gas is greatly influenced by o ther factors besides the gas and the electrode separation.
Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum by V. N. Maller